62 SYNOPSIS OF THE FAMILY HETEROPYGII. 



Habits. Nothing is known concerning the habits of this species, 

 the only specimens observed being the three mentioned. From the 

 fact of its having a single ovary containing a small number (about GO) 

 of large eggs it is probable that it is viviparous. 



Chologaster Agassizii PUTNAM. 



PUTXAM, Amer. Nat., vi, p, 22 et seq., with figs. Jan., 1872. 



PLATE 1 (Amer. Nat., Vol. vi, Jan., 1872). FIG. 4. Natural size; 4a, stomach 

 andpyloric appendages, twice nat. size; 46, scale magnified (nat. size shown lay 

 minute dot over left of the figure). 



Head more than half as wide as it is long. Its length is contained 

 three times in the length of the body from the operculum to the base 

 of caudal fin. 



Eyes proportionately large and placed over ends of maxillaries. 



Dorsal and anal fins broken, but probably of about equal size. Anal 

 fin commences about under fourth ray of dorsal. 



Pectoral fins pointed and reaching about half way to the dorsal. 



Caudal fin pointed, not quite as long as the head. 



Scales very minute, longer than wide, with 4 or 5 concentric 

 lines round a granulated centre. A few radiating furrows cut the 

 concentric lines on the posterior margin. 



Pyloric appendages and stomach about the same as in C. cornutus. 



Color. Uniform light brown, without markings except that the base 

 of the caudal fin is rather darker than rest of fish. Fins uncolored. 



Measurements. Total length, 1-4 inches. 



Geographical distribution. Subterranean streams in Tennessee. 



Specimen examined: 



MUSEUM OF COMPARATIVE ZOOLOGY. 



1 specimen. No. 777. From a well in Lebanon, Tenn. Presented by J. M. 

 Safford. Jan., 1854.. 



This species principally differs from C. cornutus by having a longer 

 body and smaller head, by having the eyes proportionately larger, and 

 by its coloration. Nothing is known of its habits except the fact 

 of its subterranean life. The scales of the single specimen known 

 indicate a young fish, and it is probably not over half grown. 



The four species given in this synopsis are all of the family 

 as yet known, but that others will be discovered and the range of the 

 present known species extended is very probable. The ditches and 

 small streams of the lowlands of our southern coast will undoubtedly 

 be found to be the home of numerous individuals, and perhaps of new 

 species and genera, while the subterranean streams of the central 

 portion of our country most likely contain other species. 



